pineapple table runner. Mountain Biking - Dirt Jumping. Advertisements. Previous Page.Dirt Jumping is a type of bike riding where the riders have to ride bikes over shaped moulds of dirt and soil. Mafia Bikes 24seven pro mountain bike /street dirt jumper for sale . BARGAIN PRICE2010 Giant STP Single speed Dirt Jumper Mountain bike for sale . Never used for dirt jumping only riding to and from work. Bike is ready to ride with no problems. Directions. Make an appointment with one of our bike experts.